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Data seized from the partner of a Guardian journalist after his arrest at Heathrow had been downloaded “indiscriminately” by Edward Snowden and could have put the lives of intelligence officers at risk, the Government believes.

Police were granted extended permission yesterday to examine the material seized from David Miranda, to investigate whether terror-related crimes or breaches of the Official Secrets Act were committed. They had previously been permitted to examine the material only for national security purposes.

Mr Miranda is the partner of Glenn Greenwald, a Guardian journalist who has worked with Mr Snowden on stories about British and US